As Of	Filer	Filing¹	For·On·As	Docs:Size	Issuer		Filing Agent

10/14/10  Vanguard Index Funds              485APOS                1:1.2M                                   Vanguard Horizon Funds   
          → S000002841 
          → ⇒ Vanguard Extended Market Index Fund Institutional Plus Shares 
          → S000002844 
          → ⇒ Vanguard Mid-Cap Index Fund Institutional Plus Shares 
          → S000002845 
          → ⇒ Vanguard Small-Cap Index Fund Institutional Plus Shares 
          → Vanguard Extended Market Index Fund
          → Vanguard Mid-Cap Index Fund
          → Vanguard Small-Cap Growth Index Fund
          → Vanguard Small-Cap Index Fund
          → Vanguard Small-Cap Value Index Fund

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¹	Filing/Form Type:
	485APOS	Post-Effective Amendment of a Form N-1 or N-1A Registration.
→	Fund / Series:  Fund or Series of this Filer with a Class or Contract that this Filing pertains to.
⇒	Class / Contract:  Class or Contract of this Fund or Series that this Filing pertains to.